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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f746ef91ccc47809d23aac35cc161969c9fab2000863b37fee69051e0913ebce' 
  AND token = 'zWxsGo8o0ny5Tbyd7XQxr3PgA3A7q3cC5gKVf/nm/vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}